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1. Make clear and (more) comprehensible
   "clear up the mystery surrounding her death";
   - clarify, elucidate
    
2. Finish a task completely
   - get through, wrap up [informal], finish off, mop up, polish off [informal], finish up
    
3. Free (the throat) by making a rasping sound
   - clear
    
4. Become free from clouds or less cloudy; become brighter
   "The sky cleared up after the storm";
   - clear, light up, brighten
    
5. Make free from confusion or ambiguity; make clear
   "Clear up the question of who is at fault";
   - clear, shed light on, crystallize, crystallise [Brit], crystalize, crystalise [Brit], straighten out, sort out, enlighten, illuminate, elucidate

Derived forms: cleared up, clearing up, clears up

Type of: complete, explain, explicate, finish, remove, take, take away, withdraw